Ecto + GraphQL example

graphql__helpers.ex

defmodule App.GraphQL.Helpers do
  alias GraphQL.Type.{ID, List}

  def build_definition(model, :single) do
    %{
      type: build_type(model),
      args: %{ id: %{ type: ID }},
      resolve: &model.resolve/3,
    }
  end


  def build_definition(model, :multiple) do
    %{
      type: %List{ ofType: build_type(model) },
      resolve: &model.resolve/3,
    }
  end


  defp build_type(model) do
    Ectograph.Schema.cast_schema(model, :ecto_to_graphql)
  end

end

graphql__root_schema.ex

defmodule App.GraphQL.Schema do
  alias App.GraphQL.{Helpers}
  alias App.{Models}

  def schema do
    %GraphQL.Schema{

      query: %GraphQL.Type.ObjectType{
        name: "Queries",
        description: "API Queries",
        fields: %{
          map: Helpers.build_definition(Models.Map, :single),
          maps: Helpers.build_definition(Models.Map, :multiple),
        }
      },

      mutation: %GraphQL.Type.ObjectType{
        name: "Mutations",
        description: "API Mutations",
        fields: %{},
      }

    }
  end

end

models__map.ex

defmodule App.Models.Map do
  use Ecto.Schema

  schema "map" do
    field :key, :string
    field :name, :string

    timestamps
  end


  def resolve(_, %{ id: id }, _) do
    # do database query for one specific map (by id)
  end


  def resolve(_, _, _) do
    # do database query for all maps
  end

end